Improvement in the modes of making telegraph-insulators



W. BROOKPIELD. MODE 0]? MAKING TELEGRAPH INSULATOR'S.

No. 113,393. I 'Patented' Apr. 4, L871.

. thedpress, with the screw-plunger.

WILLIAM BnooKrrELn, orN w-YonK, N. r.

Letters Patent No. nasgsfaatea April 4,1871.

IMPROVEMENT IN THE MODES OF' MAKING T:tEeRAPn-|nseLAroRs.

The Schedule referred to these Letters Patent and making of the To all whont it may concern Be it known that I, \VILLIAM Bnoonrmnn, of the city, county,and State of New York, hare invented a new and improved Mode of Making 'lelegraph-ln-v sulatoryand I do hereby declare the tbllowiug to he a full, clear, and exact description tlnbreot', which will enable those skilled in the artto make and use the same, reference being bad. to the accompanying draw ing forming part of this specification, in which draw- 1ng-- Figure 1 is an elevation, partly in section, of a lever-press with detachable screw-plungeror former, and a mold for telegrapit-insulators. V Figure 2 is a. cross-section through "the spindle of showing one form of detachable connection 'lligure Q5 is a section of the mold and plunger detached.

Siinila1' letters indicatecorrespondingparts.

This invention relates to the manufacture of screw telegrapli-insulators, of glass or other, molten mate-' rial; and consists in a new and improved process, by which I subjectthe molten glass or metal in the -mold to the action of a press, -to whose spindle is connected a sta'eu plungcr or former, by a detachabie connection, and after the screw-plunger has been pressed or forced into the glass. or metal, and the socket and screw-thread in the insulator formed, L

and withdraw the mold, with the plunger 1 therein, from the press. F

I then connect a fresh screw-plunger or former to the spindle of'the press in readiness to press or force into the next inold, and so proceed, using as many screw-plnngersand molds as are necessary to keep the press employed, the detached plunger-s or formeis being screwed out of the molds as soon as the glass or metal has set.

In carrying out my process I usea lover or a disconnect the screw-plunger or former from the press emaining screw-press, but in theprescnt' illustration I have selected a lever-press, A, to-whose spindle B I attach a screw plunger or former-,0, bya detachable connection, so that the renewal of the plunger can be easily and rapidly eflected.

The bottom of the spindle is slotted, in this example, to receive the shanli ot' the screw-plunger,

whieh is held to the spindle by a sot-screw, 1); but the bottom of the spindle may be made with a socket of any desired form, instead of being slotted across, as here shown, the shank of the spindle being made of a corresponding financito fit into the spindle easily,

so tnat itcan be connected or disconnected with facility.

--A key or other fastening device can be used instead of a set-screw.

After the scre\v-plunger or forr'ner-O'is attached raisethe vspimlle of the press and place under the plunger a mold, ]'1,'eontaini1 igthe hot metal or glass, and press or force the plunger down into the mold,

and immediately afterward detach the plunger, withdraw the mold with the newly-formed insulator and the screw-plunger therein, attach a fresh screw-phmger to thespimlle and raise it, to allow a fresh lnoldr with hot metal or glass to' be placed on the press; when the operation. is repeated, the screw-plunger!!!- being screwed out of the newly-formed insulator di'-' rectlyafter the molds are withdrawp, or as soou ias the inetal or glass has set,the mold bein then opened and the insulators taken out, so that t e molds can be used in succession one after the other, two or more v molds and scrcw-plungers being used advantageously in the process. v

Myinvention enables me to employ two or more screu phmgers' and as many molds continuously in. connection with a-single press in the manufacture of scre\\'-telegraph insulators, and to dispense [with the operation of screwing the screw-.1ilnnger out of the newly-thrilled insulator by means of'th'e press before' the mold can be removed therefrom.

Iii-screwing the plunger out after the glass has set any suitable tool or wrench may be used or the plan:

ger may be attached to a screw-spindle or othermeclranism, so that it can be screwed out true and withou injuring the thread iu'the insulator.

I donut claim anything new in the construction of thepress which I use in carrying out my invention:

but r I 1 \Vhat 1 claim as new. and desire to secure by Let-' ters Patent, is- V The within-described process fol-making scrc w telegraph insulators, said process consisting of the following successive operations: first, filling the mold with molten glass and depressing the plunger; secend, releasing the plunger and raising the spindle of the press; third, removing t'lie 'ilunger and the mold from under the prcss; fourth, inserting a new plunger and fastening thesa ne in the spindle, and iirtrodming a fresh mold, all as herein set forth.

'- WM. BROOKFIEL'D.

Witnesses:

W. Haurr,

E. F. KAsrssnomm. 

